Fan base case

ABSTRACT

A fan case base, which is for being mounted with a fan wheel having a hub and a plurality of fan blades surrounding the hub, includes a base support, a frame and a plurality of engaging parts. The base support is attached with the fan wheel. The frame is disposed around the periphery of the base support and provides the height thereof less than that of the fan blades. The engaging parts are disposed at the top of the frame for the fan case base being attached to an article and provide the height thereof greater than that of fan blades. The fan case base  2  can provide a best mode of guiding the airflow, enhancing the effect of cushion and shock absorption during the airflow entering the frame  22  and the fan blades  32  of the fan heel  3  not touching the frame  22  even in case of the fan case base  2  being hung vertically.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention is related to a base case and particularly to a fan base case.

2. Brief Description of the Related Art

The conventional base case of a cooling fan is used for being attached with a fan wheel and the combination of the base case with the fan wheel is attached to a casing of system such as a computer, a power supplier or a server corresponding to the ventilation outlet thereof. Once the fan wheel starts to run, the ambient heat of the electronic component can be dissipated outward through the ventilation outlet. Referring to FIG. 1, Taiwanese Patent Official Gazette No. 535859, entitled FAN FRAME, primarily provides a recess part 14 at the side edge 12, which is disposed outside the opening 11 of the fan frame 10, and an auxiliary intake hole 16 is formed between the recess part 14 and the opening 11 to enhance the area available for the intake air and to increase the air flow for dissipating heat.

When the fan blades 18 of the preceding conventional cooling fan 1 starts to run, the airflow can be introduced via the opening 11 and the auxiliary intake hole 16. But, due to the auxiliary intake hole 16 being disposed at the side edge 12 of the fan frame 10 outside the opening 11, a slant stop wall 13 is provided at the fan frame 10 between the auxiliary intake hole 16 and the opening 11 and turbulent flow generates at the circumferences of the opening 11 and the auxiliary intake hole 16 respectively. The turbulent flow can hit the stop walls 13 to create noise and how to reduce the noise is a subject worth us to overcome.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a fan case base, which can reduce turbulent flow and noise generating by way of the air flow entering the frame and a situation of the fan blades touching the frame.

Accordingly, the fan case base of the present invention, which is for being mounted with a fan wheel having a hub and a plurality of fan blades surrounding the hub, includes a base support, a frame and a plurality of engaging parts. The base support is attached with the fan wheel. The frame is disposed around the periphery of the base support and provides the height thereof less than that of the fan blades. The engaging parts are disposed at the top of the frame for the fan case base being attached to an article and provide the height thereof greater than that of fan blades. The fan case base 2 can provide a best mode of guiding the airflow, enhancing the effect of cushion and shock absorption during the airflow entering the frame and the fan blades 32 of the fan wheel not touching the frame even in case of the fan case base being hung vertically.

BRIEF DESCRIPTION OF THE DRAWINGS

The detail structure, the applied principle, the function and the effectiveness of the present invention can be more fully understood with reference to the following description and accompanying drawings, in which:

FIG. 1 is a sectional view of the fan frame disclosed in Taiwanese Patent Gazette No. 535859;

FIG. 2 is a perspective view of a fan base stand according to the present invention in a first embodiment thereof;

FIG. 3 is a sectional view of the fan base stand shown FIG. 2 illustrating the fan base stand being in a state of flatly positioning;

FIG. 4 is an another sectional view of the fan base stand shown FIG. 2 illustrating the fan base stand being in a state of being suspended;

FIG. 5 is a further sectional view of the fan base stand shown FIG. 2 illustrating the fan base stand being in a state of being side hung; and

FIG. 6 is a perspective view of a fan base stand according to the present invention in a second embodiment thereof.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIGS. 2 and 3, a fan base case 2 of the present invention in the first embodiment thereof is used for mounting a fan wheel 3 and the fan wheel 3 includes a hub 31 and a plurality of fan blades 32 disposed at the periphery of the hub 31. The fan base case 2 includes a base support 21, a frame 22 and four engaging parts 23.

The base support 21 is attached with the fan wheel 3.

The frame 22 is provided to surround the base support 21 and the fan blades 32 have a height greater than the frame 22. The frame 22 has a square shape in the present embodiment.

The engaging parts 23 are located at four upper corners of the frame 22 for the fan base case being attached to an article 4 and each of the engaging parts 23 has a cylindrical element 231 with an engaging through hole 232. The cylindrical element 231 provides a height greater than that of the fan blades 32. The engaging parts 23 are made of rubber.

Comparing to Taiwanese Official Gazette No. 535859, the fan base case 2 of the present invention has the following advantages and effects:

1. The fan base case 2 of the present invention provides quieter running:

Referring to FIG. 3, the fan base case 2 is designed to have a height greater than that of the frame 22 and less than that of the cylindrical element 231 of each engaging part 23. In this way, there is no isolating part being disposed between the frame 22 and the fan blades 32 such that an unimpeded passage of air flow between the fan wheel 3 and the outer side and the inner side of the frame 22 for the air introduced by the fan wheel 3 avoiding to become turbulent flow hitting the inner wall of the frame 22 and occurring noise. Therefore, the fan case base 2 of the present invention can overcome disadvantages of the prior art such as the phenomenon of generating turbulent flow and occurring noise.

2. It is not possible for the fan blades to touch the fan case base while the fan of the present invention is hung during being in use:

Referring to FIG. 4, the fan case base 2 can be disposed in a state of being hung in addition to being disposed in a state of being flatly laid in an article 4 such as the casing of a computer main unit. In this way, due to the fan blades 32 of the fan wheel 3 being provided with a height greater than that of the frame 22, the fan blades 32 do not touch the frame 22 in case of the fan wheel 3 slightly moving upward because of high speed rotation. Therefore, the fan blades 32 or frame 22 being damaged resulting from hitting can avoid.

3. The present invention provides a function of cushion with shock absorption:

Referring to FIG. 4 in company with FIG. 3, an extremely large airflow route is formed in the frame 22 during the fan wheel 3 rotating with high speed and it results in the fan case base 2 swaying. Each engaging part 23 is made of rubber with cushion and shock absorption capability and the cylindrical element 231 of each engaging part 23 can be attached to the article 4 such as the casing of a computer main unit with a screw fastener (not shown) engaging with the cylindrical element 231 such that a sound function of cushion and shock absorption can be obtained effectively. Similarly, referring to FIG. 5, once the fan case base 2 of the present invention is hung vertically while in use, the excellent effect of cushion and shock absorption can be obtained under high speed rotation of the fan wheel 3 by way of the engaging parts 23 being attached to the article 4 such as the casing of a computer main unit. Further, a steady and stable running state of the fan can be maintained substantially.

Referring to FIG. 6, the second embodiment of the fan case base 2 according to the present invention includes a base support 21, a frame 22 and four engaging parts 23. The difference of the second embodiment from the first embodiment is that each engaging part 23 has an angle projection 233 corresponding to the frame 22 with a locating hole 232 passing through the projection 232. In practice, it is another configuration of the engaging part 23 and it also can lower the turbulent flow and noise, enhancing the effect of cushion and shock absorption during the airflow entering the frame 22. Further, it is not possible to occur the fan blades 32 of the fan wheel 3 touch the frame 22.

It is appreciated that the fan case base 2 of the present invention can provide a best mode of guiding the airflow, enhancing the effect of cushion and shock absorption during the airflow entering the frame 22 and the fan blades 32 of the fan heel 3 not touching the frame 22 even in case of the fan case base 2 being hung vertically.

While the invention has been described with referencing to preferred embodiments thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims. 

1. A fan case base for being mounted with a fan wheel having a hub and a plurality of fan blades surrounding the hub, comprising: a base support, being attached with the fan wheel; a frame, being disposed around the periphery of the base support and providing the height thereof less than that of the fan blades; and a plurality of engaging parts, being disposed at the top of the frame for the fan case base being attached to an article and providing a height thereof greater than that of fan blades.
 2. The fan case base as defined in claim 1, wherein the frame has a cubic shape with four corners thereof being provided with and each of the engaging parts is made of rubber.
 3. The fan case base as defined in claim 2, wherein each of the engaging parts has a cylindrical element and a locating hole passes through the cylindrical element.
 4. The fan case base as defined in claim 1, wherein each of the engaging parts has an angle projection corresponding to frame and a locating hole passes through the projection. 